Metalloid is a Kadurian from the planet Ferrosphere in the movie Omni-Knights: Knight at the City. He will probably never appear in the series itself (although he might have an animated pic drawn for him).
When Paul transforms into Metalloid, he usually starts as a tiny, silver ball. He can duplicate as much as he wants, and the balls can usually stick to each other, to form bigger forms.
Metalloid can duplicate the spheres as much as he wants. He can shapeshift to almost anything when the balls are connected, and grow bigger whenever the balls duplicate. Also, he doesn't need to stay in one form, he can split into as much forms as he wants. His sphere can become electric and be thrown as a weapon. The spheres are also almost indestructible.
Water will make him electrocute himself and the spheres unconnect.